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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1263 | * @since 4.4.0 |
| 1264 | * |
| 1265 | * @param string $sizes A source size value for use in a 'sizes' attribute. |
| 1266 | * @param array|string $size Requested size. Image size or array of width and height values |
| 1267 | * in pixels (in that order). |
| 1268 | * @param string|null $image_src The URL to the image file or null. |
| 1269 | * @param array|null $image_meta The image meta data as returned by wp_get_attachment_metadata() or null. |
| 1270 | * @param int $attachment_id Image attachment ID of the original image or 0. |
| 1271 | */ |
| 1272 | return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id ); |
| 1273 | } |
| 1274 | |
| 1275 | /** |
| 1276 | * Filters 'img' elements in post content to add 'srcset' and 'sizes' attributes. |
| 1277 | * |
| 1278 | * @since 4.4.0 |
| 1279 | * |
| 1280 | * @see wp_image_add_srcset_and_sizes() |
| 1281 | * |